Influence of Pretreatment on Cerium Conversion Coatings of Aluminum Alloys

Abstract:

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With the certain deposition process, the conversion coatings by four different
pretreatments on LF21 were studied. The morphology and the chemical composition of the
conversion coatings were examined by scanning electron microscopy (SEM). The corrosion
resistance was investigated by electrochemical impedance spectroscopy (EIS) and the salt spray test.
The results showed that the different pretreatments had obvious effect on the cerium conversion
coatings. For the certain deposition process, the optimal pretreatment process was identified.